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Northwest Africa 8741
Basic information Name: Northwest Africa 8741
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8741
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 22.3 kg
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Mesosiderite-A4
Recommended:  Mesosiderite-A4    [explanation]

This is 1 of 4 approved meteorites classified as Mesosiderite-A4.   [show all]
Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 27 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8741 (NWA 8741)

(Northwest Africa)

Purchased: April 2014

Classification: Mesosiderite (group A4)

History: A single stone was purchased by anonymous dealer from nomads.

Physical characteristics: The 22.3 kg stone has isometric shape. A surface is dark brown. Fusion crust is not preserved.

Petrography: The meteorite is composed of (vol%) silicate matrix (71.8) and metal (28.2). The silicate matrix is medium-grained rock of poikilo-ophitic texture. The rock composes of anhedral and subhedral grains of pyroxene (34.9) surrounded by anhedral and subhedral grains of feldspar (38.5), pyroxene, metal (8.7) and prismatic needles of silica phase (17.9). Larger pyroxene grains poikilitically enclose the grains of all other phases. Minor phases are troilite, schreibersite, chromite, ilmenite and phosphate. The meteorite contains minor large xenocrysts of pyroxene, xenoliths of pyroxenites, metal nodules and rare metal veins connecting the large metal grains.

Geochemistry: Pyroxene: Fs33.9-39.0Wo1.8-3.7 (average Fs37.3Wo2.9; Fe/Mn=24) and Fs15.0-18.1Wo41.1-42.8 (average Fs17.2Wo41.9; Fe/Mn=18.6), feldspar An85.2-90Ab9.8-14.4. Xenocrystic pyroxenes are zoned Fs30.0Wo2.1 (core) – Fs35.7Wo2.7 (rim) (average Fe/Mn=29). Pyroxenite xenoliths: Px is Fs20.8Wo1.2 (Fe/Mn=30), interstitial Px is Fs24.7Wo2.3 (Fe/Mn=30.3), feldspar An84.4-93.5Ab6.3-14.9.

Classification: Mesosiderite-A4. Minimal weathering.

Specimens: A type specimen of 118.95 g and five thick polished sections are on deposit at Vernad. Anonymous dealer holds a main mass.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P April 2014
Mass (g):22300
Pieces:1
Class:Mesosiderite-A4
Ferrosilite (mol%):37.3
Wollastonite (mol%):2.9
Classifier:C. A. Lorenz, Vernad, F. Brandstaetter, NHMV
Type spec mass (g):118.95
Type spec location:Vernad
Main mass:anonymous
Comments:Field Name is MB2014; submitted by C. A. Lorenz
Institutions
   and collections
NHMV: Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, Austria; Website (institutional address; updated 18 Jan 2019)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
KD Meteorites   
Woreczko Jan & Wadi   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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